Method and apparatus for removal of grease, smoke and odor from exhaust systems

ABSTRACT

A grease, smoke, and odor extraction system includes an outer housing including an entrance passage and an exit duct for drawing the exhaust airstream through the housing, the entrance passage is fitted with a pipe which discharges ozone gas into the exhaust air and, alternatively, a water supply manifold which directs the water into the ozonated exhaust stream in such as way as to create a vortex of water droplets in the ozonated exhaust stream to encourage the extraction of grease, fumes, and other contaminants from the stream. Several alternate embodiments as described including a housing, an ozone generator, an ozone injector into the housing in combination with a baffle member and alternatively water and filter members for use with kitchen exhaust systems as well as water treatment systems and the like.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of Ser. No. 10/418,603,filed 18 Apr., 2003 for METHOD AND APPARATUS FOR REMOVAL OF GREASE,SMOKE AND ODOR FROM KITCHEN EXHAUST SYSTEMS invented by Arlen Gallagherand incorporated by reference herein.

BACKGROUND AND FIELD OF INVENTION

This invention is directed to improvements in ventilating systems of thetype disclosed in U.S. Pat. No. 5,042,457 ('457) for GREASE EXTRACTIONVENTILATOR APPARATUS, by Arlen W. Gallagher, owned by the inventor ofthis invention. One purpose of the '457 patent was to provide aventilator system in which the grease vapors and lint could be removedwithout a water reservoir or grease entrapment area at the bottom, aswell as to avoid accumulation on the interior walls of the ventilatorand particularly to avoid baked-on grease deposits which will preventwater from absorbing heat from the walls of the ventilator. Although thesystem of the '457 patent has proven highly effective in use, it doesrequire some maintenance and cleaning on a regular basis as contaminantscollect and accumulate on the interior walls of the ventilator.

It is desirable to provide a ventilator system in which contaminants,including odors, can be removed through use of ozone in combination withthe creation of a vortex of exhaust air for extraction of contaminantsfrom air and, alternatively, water or a method or means to avoidrepeated cleaning of the apparatus.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide for anovel and improved contaminant extraction ventilator adaptable for usewith cooking equipment and the like.

Another object of the present invention is to provide for a novel andimproved method and means for extracting contaminants such as grease,odors and smoke as they are produced, rather than permitting them tobecome deposited on the interior walls of the ventilator or duct work.

Another object of the present invention is to provide a ventilatorapparatus which generates a sheet or film of water with entrained ozonewhich is suspended and recirculated by a flow of air, therebyefficiently and continuously removing contaminants by centrifugal force,entrapment, oxidation and condensation.

Another object of this invention is to provide a ventilator apparatuswhich discharges ozone into an exhaust stream thereby oxidizingcontaminants and avoiding repeated cleaning of the apparatus.

In accordance with the present invention, there is provided an apparatusfor extracting grease and other contaminants from an exhaust airstreamin which a housing includes means for inducing the flow of exhaustairstream therethrough and, alternatively, water-injecting means areprovided for injecting water into the housing in countercurrent relationto the flow of the exhaust airstream, the improvement comprising asource of ozone and discharge means for injecting the ozone continuouslyinto the exhaust airstream prior to intermixture of the exhaustairstream with the water so as to create a vortex of ozonated water forefficient removal of the grease and other contaminants from theairstream.

In accomplishing the foregoing, an ozone-producing apparatus, or ozonegenerator, produces a concentration of pure ozone which is introducedinto the exhaust air which is moving upwardly through an air inletpassage between an air inlet baffle and a back wall of a scrubbingchamber. Fresh water is introduced above the air inlet and bygravitation moved downwardly along the air inlet baffle where it slidesoff horizontally into the vertically upward path of the ozonated exhaustairstream. The ozonated exhaust air is intercepted by the flow of watermoving horizontally away from the air inlet baffle, thereby lifting thewater upwardly and through a narrow channel formed by the air inletbaffle and the back wall of the scrubbing chamber. The ozonated exhaustair combines with the water flow causing ozone to be entrained withinthe water flow. Ozone is naturally unstable and will oxidize and reactwith a target compound, such as, grease, odors and smoke, the ozonereverting to molecular oxygen as a byproduct. As the volume of watersuspended in the ozonated exhaust airstream increases, the weight of thewater against the upward air movement will cause its spread in ahorizontal direction resulting in an even distribution of recirculatedwater throughout the entire length of the unit. When the weight of watersuspended within the ozonated airstream reaches the maximum amount thatcan be supported, it is free to drain downwardly along the rear wall ofthe scrubbing chamber into a full width trough; and the excess watertogether with any entrained contaminants may then be suitably carriedaway through a conventional drain into the building drainage system.

In an alternate embodiment of the present invention, there is provided aventilating system for extracting grease, odors and solid particles froman exhaust airstream in which a housing includes an entrance passage andexit duct, means for inducing the flow of the exhaust airstream throughthe entrance passage, filter means, ozone producing means, means forinjecting ozone into the exhaust airstream from a location above thefilter means, the filter means having a pair of spaced filter supportsand a filter member therebetween, and the filter member extendingdiagonally along a substantial length of the housing.

A further embodiment includes a ventilating system for extractinggrease, odors and solid particles from an exhaust airstream including ahousing with an entrance passage, air inlet baffle means and a drychamber, means for inducing the flow of the exhaust airstreamtherethrough, means for injecting the ozone into the exhaust airstreamat the entrance passage, baffle means having spaced diverter panels, andmeans for injecting water into the housing from a location above thebaffle means for discharging water into the housing in countercurrentrelation to the flow of the exhaust airstream.

A final embodiment includes a ventilating system for extracting grease,fumes and solid particles from an exhaust airstream created by a cookingappliance including a housing with an entrance and exit passage, diffusemeans and filter means contained within said housing, means for inducingthe flow of the exhaust air through the housing, means for generatingozone and means for injecting ozone into the housing to provide evendistribution of ozone gas into the exhaust airstream.

The above and other objects of the present invention will become morereadily appreciated and understood from a consideration of the followingdetailed description of a preferred embodiment and several alternateembodiments when taken together with the accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an enlarged cross-sectional view in accordance with thepresent invention;

FIG. 2 is a perspective view of the ventilating system shown in FIG. 1;

FIG. 3 is an enlarged cross-sectional view of an alternative embodimentof the present invention;

FIG. 4 is a cross-sectional side view of an alternate embodiment of thepresent invention;

FIG. 5 is a perspective view of the alternate embodiment shown in FIG.4;

FIG. 6 is a cross-sectional side view of another alternative embodimentof the present invention; and

FIG. 7 is a perspective view of the alternative embodiment shown in FIG.6.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

Referring in more detail to the drawings, specifically FIGS. 1 and 2, apreferred form of ventilator apparatus 10 is installed in a conventionalmanner above a cooking appliance A and is made up broadly of a hood orhousing 12 having a lower inlet passage area 14 and an upper exhaustduct 16. In a well-known manner, the exhaust duct or collar 16 isconnected into the flue of a chimney or other exhaust system availablein the building, which typically includes an exhaust fan downstream ofthe exhaust duct 16, to induce the upward and outward flow of vapors andcontaminants generated by the cooking appliance through the air inletpassage 14.

In one form, the hood 12 is of generally rectangular configuration andelongated to traverse the substantial width of the cooking appliance andwith the air inlet passage centered in spaced relation above theappliance. As further shown in FIGS. 1 and 2, the exterior of the hood12 includes opposite end walls 18, a top horizontal wall 20 and rear andfront vertical walls 21 and 22 extending between the end walls 18. Theair inlet passage 14 is formed between spaced, parallel, upper and lowerinclined panel sections 24 and 25, respectively. Lower panel 25terminates in a reverse curved lip 25′ facing inwardly toward the airpassage 14 and upwardly toward the panel or baffle member 24.

Inserted within the interior walls of the reverse curved lip 25 is arigid stainless steel pipe 11 which extends the full length of hood 12and protrudes through end wall 18 at which point it is connected toflexible stainless steel tubing 13 connected to an ozone output port 15on an ozone producing apparatus 17. The rigid stainless steel pipe 11under the reverse curved lip 25′ is fitted with equally spaced roundperforations 19 as seen in FIG. 1 to provide even distribution of ozonegas into the exhaust air along the full length of the air inlet passage14.

The flexible stainless steel pipe 13 connected to the end of rigidstainless steel pipe 11 shown in FIG. 2 extends to the ozone port 15 onthe ozone producing apparatus 17 which may include an oxygenconcentrator C, and cooling fan(s) F, adjustable flow gauges G, highvoltage electrodes V, and electrical control panel F designed for propersequence of operation for the oxygen concentrator C and the electrodes Vto accomplish removal of moisture within the ozone-producing apparatus17 prior to its being turned on, and to accomplish removal of ozone gasfrom within the ozone-producing apparatus, the flexible stainless steeltubing 13, and the rigid stainless steel pipe 11 after theozone-producing apparatus has been shut off. This is shown in FIG. 2A inaccordance with well-known prior practice.

The air inlet passage 14, as best seen from FIG. 2, is formed betweenthe spaced, parallel, upper and lower inclined panel sections 24 and 25,respectively. A lower inclined wall 26 is directed at a relatively lowangle away from a front vertical wall 22, and an adjustable baffle platemember 23 forms a continuation of the panel 24 and is slidable toward oraway from the rear wall 21 by loosening set screws (not shown) whichreleasably lock the baffle members 23 and 24; and the plate 23terminates in a horizontal ledge 27 in closely spaced relation to therear wall 21 as shown in FIG. 1. The lower panel 25 inclines forwardlyand upwardly away from a horizontal support panel 28 at a lower edge ofthe rear wall 21, the panel 28 extends into a drain pipe 32 throughwhich any excess water together with collected grease, fumes andcontaminants are removed through the lower end of the hood 12.

A water feed pipe 40 includes a cold water solenoid valve 41 and hotwater solenoid valve 42. Cold and hot water valves 41 and 42 arecontrolled by a valve controller (not shown) preferably, a Siemensprogrammed logic controller made by Siemens Aktiengesellschaft JointStock Co. of Munich, Germany. The hot and cold valves 41 and 42 aremounted on top of the hood 12 directly above the water feed pipe and areconnected together forming the water feed pipe 40. Located within thepipe 40, downstream from the hot and cold water solenoid valves 41 and42 is an injector 44, preferably a Dema injector, manufactured by TheDema Engineering Company, St. Louis, Mo., through which both hot andcold water flow, forming a venturi that draws liquid chemical into theincoming water.

An upper water inlet 34 is directed into manifold 35 at an upperinterior corner of a top wall 20 and front wall 22; and the manifold 35includes downwardly extending nozzles 36 which traverse the length ofthe front wall 22 directly beneath and supported by the top wall 20.Another lower water feed pipe 38 is positioned at an interior lowercorner between the front wall 22 and lower wall 26 and is provided witha series of horizontally directed nozzles 39.

An important feature of the present invention resides in a scrubbingchamber which is formed directly above and in communication with the airinlet passage 14. An air deflector panel 50 extends upwardly andforwardly away from the rear wall 21 in spaced, substantially parallelrelation to the panel 24, and the panel 50 functions also as a bracketsupport for a horizontal deflector panel or plate 52 which extendsforwardly away from the rear wall 21 and terminates in a downwardlydirected lip 53. The horizontal panel 52 forms a horizontal extension ofthe inclined deflector plate 50 and, together with the plate 50, definesa forwardly convergent scrubbing chamber or area for intermixing of theexhaust airstream from the cooking appliance with the water dropletsfrom the water manifold 44. An upper open plenum area 60 is formed bythe outer walls of the hood 12 above the scrubber chamber andspecifically above the horizontal deflector 52.

In practice, when the exhaust fan is turned on, the logic controllerdirects the release of cold water and detergent through the pipe 40 andthe manifolds 35 and 38 for downward movement along the wall 26 into thescrubbing chamber area as defined. The exhaust airstream is drawninitially in a downward direction through the inlet passage 14, ozonegas is injected into the exhaust airstream through the rigid steel pipe11, then ozonated exhaust air is caused to undergo a reversal in flowaround the lower edge of the panel 24 and advance upwardly through thescrubbing chamber. As the air flow turns upwardly and advances past thedownward flow of water and draws the water upwardly to a level adjacentto the lip 53 where the air velocity decreases and allows the water tofall in a somewhat circular path toward the walls 22 and 26. As thewater continues to move downwardly along the lower wall 26 incountercurrent relation to the flow of air it will once again be pickedup by the flow of air thereby creating a vortex action with the water incontinuous suspension in the airstream. The volume of water insuspension will vary in accordance with the air flow volume and thesetting of the air inlet baffle plate 23. When the scrubbing chamber hasabsorbed the maximum capacity of water into the air, any excess waterwill escape from the chamber and advance along the panel 21 into thelower trough or the drain section 28, and the water will tend to collectany grease vapors or other contaminants and carry the contaminants awaywith it as it is drained off through the bottom, particularly any of theheavier or solidified particles of grease.

Typically, the ventilator system will run continuously in a commercialestablishment and, at the end of the day, when the exhaust fan is shutoff, the water held in suspension will drain into the drain system. Theupper and lower manifolds 35 and 38 contain detergent and hot water,generated by the logic controller through the hot water solenoid valve42, to flush the scrubbing chamber and total interior of the hood. Afterthe cleaning cycle is completed or the exhaust fan turned on, fresh coldwater will then refill the scrubbing chamber to form a continuous waterfilter as described.

It will be evident from the foregoing that any necessary adjustments tothe baffle plate 23 and the valves 41, 42 can be made at the time ofinstallation according to the mass flow rate of air from the workingequipment. The cold water released at the opposite ends 45 and 46, andthe length of the housing will migrate across the entire length of thepanel 26 to effectively form a continuous sheet or stream of waterflowing across the length of the panel 26 and downwardly toward thescrubbing chamber so that a water filter is formed effectively along thelength of the housing. Removal access panels (not shown) are provided onthe front wall 22 in order to gain entry into the interior plenum area60 for maintenance or repair and periodic cleaning of the interior ofthe hood 12.

The invention may also run as a “dry” system without addition of waterthrough manifolds 35 and 38. The exhaust airstream is drawn in adownward direction through the inlet passage 14, ozone gas is injectedinto the exhaust airstream through the pipe 11, then ozonated exhaustair is caused to undergo a reversal in flow around the lower edge of thepanel 24 and advance upwardly through the scrubbing chamber. Thereversal in flow causes further intermixing of the ozone with theexhaust airstream resulting in oxidation of contaminants and formationof oxygen gas. The ozonated exhaust air, oxygen and oxidizedcontaminants continue to move upwardly towards the lip 53, causing aslight reversal in the air flow, resulting again in further intermixing.The exhaust airstream then continues upwardly through the open plenumarea 60 and exits through the duct 16.

In an alternate embodiment of the present invention as seen in FIG. 3, aventilator apparatus 55 is made up broadly of a hood 56 having a lowerinlet passage area 57 and an upper exhaust duct 58. The exhaust duct 58includes an exhaust fan (not shown) installed downstream in an exhaustsystem designed to direct the flow of exhaust air through the hood intothe exhaust system and outside into the atmosphere.

In this form, the hood 56 is of generally rectangular configuration andelongated to traverse the substantial width of the cooking appliance. Asshown in FIG. 3, the hood 56 includes rear and front vertical walls 59,59′, respectively, a top horizontal wall 61 and side vertical walls (notshown) extending between the vertical walls 59, 59′. Placed within thehood 56 is a metal baffle-type filter 62 which is placed diagonallyalong an upper corner between the rear wall 59 and the top horizontalwall 61. The filter 62 is secured in place by upper filter support walls63 and 65 and lower support bracket 67.

Inserted within a corner formed between the top wall 61 and the upperfilter support 65 is a rigid stainless steel pipe 69 which extends thefull length of the hood 56 and protrudes through the side wall, notshown, at which point it is connected to flexible stainless steel tubingand downline to an ozone generator as described earlier. The rigidstainless steel pipe 69 is fitted with equally spaced round perforations64 to provide even distribution of ozone gas into the exhaust air alongthe full length of an air outlet plenum 66.

In practice, when the exhaust fan is turned on, the exhaust airstream isdrawn upwardly through the inlet area 57 and passes through the filtermember 62 at a high velocity. As the exhaust air moves through thefilter member 62, grease, vapors or other contaminants are removed fromthe exhaust air and any remaining grease vapors and exhaust air movethrough to the air outlet plenum 66. Ozone gas is injected through theexhaust airstream through the pipe 69, out through the perforations 64,causing intermixing of ozone with the exhaust airstream, resulting inoxidation of contaminants forming byproducts, such as, oxygen and water.

In another alternate form of the present invention, as shown in FIG. 4,a ventilator apparatus is made up of a housing 73 having a side inletpassage area 75 and an opposite side exhaust area 77. In this form, thehousing 73 is of generally rectangular configuration. As shown in FIGS.4 and 5, the exterior of the housing 73 includes opposite end walls 78,top and bottom horizontal walls 79 and rear and front vertical walls 81and 83, respectively, extending between the end walls 78. The air inletpassage 75 is formed between spaced, parallel, upper and lower inclinedpanel sections 80 and 82, respectively.

Located at the entryway E of the inlet passage 75 is a rigid stainlesssteel pipe 85 which extends the full length of the front vertical wall83 and protrudes through the end wall 78 at which point it is connectedto flexible stainless steel tubing which is then connected to an ozoneoutlet port 15 on the ozone producing apparatus 17 as described earlierand as shown in FIG. 2. The rigid stainless steel pipe 85 is fitted withequally spaced round perforations 76 to provide even distribution ofozone gas into the exhaust air along the full length of the air inletpassage 75. Intermixing is also aided with the pressure of the upper andlower inclined sections 80 and 82, which effectively form an air inletbaffle.

A water inlet 87 is directed into manifold 89 at an upper interiorportion of housing 73. The manifold 89 includes downwardly extendingnozzles 91 which are at spaced intervals extending along the full lengthof the front vertical wall 83. Water is discharged into a lower frontend of the housing 73 where it advances along panel 90 into lower trough92 where it is piped to a recirculating water pump 94 and pumped backthrough the water inlet 87 up to the manifold 89.

An important feature of the present invention resides in a scrubbingchamber which is formed directly above and in communication with the airinlet passage 75. Spaced diverter panels 93 are located directly beneaththe nozzles 91 and together with diffuse means in the form of aperforated plate 95 defines a forwardly convergent scrubbing chamber orarea for intermixing of the exhaust airstream with the ozone and waterdroplets from the manifold 89. As described previously, this isimportant for proper intermixing resulting in effective removal ofcontaminants.

An upper open plenum area 97 is formed by an upper surface of theperforated plate 95 above the scrubber chamber and air deflector panel99. The perforated plate 95 is preferably formed of a metal sheetcontaining perforations to cause further intermixing of the exhaustairstream with the ozone. The air deflector panel 99 extends downwardlyand forwardly towards the front wall 83. A secondary plenum area 101 isformed by the air deflector panel 99 and an outer surface of primaryfilter 103. There is a secondary filter 105 which is located paralleland contiguous to the primary filter 103. The filters 103 and 105 form afiltration barrier in conjunction with upper and lower filter supports107 and 108, respectively.

A tertiary rear plenum area or dry chamber 111 includes at least onerow, preferably two, of high efficiency filters 113 and 115 which arepreferably high efficiency glass fiber filters or charcoal filters. Thefilters are located in a rear, upper portion of housing 73 to providefinal filtration of the exhaust airstream prior to exiting through theside exhaust area 77.

In practice, when the exhaust fan is turned on, the recirculating pump94 is turned on which allows for recirculation of water along the waterinlet 87 into the scrubbing chamber area as defined. The exhaustairstream is drawn initially through the inlet passage 75, through useof an exhaust fan, then is intermixed with ozone gas through use of theozone generator as previously described. The ozonated exhaust air isdrawn upwardly through the diverter panels 93. As the exhaust air flowsupwardly into the diverter panels 93, the exhaust airstream is forced invariable directions causing further intermixing of the exhaust airstreamwith ozone gas and the downwardly flowing water. As the water continuesto move downwardly along the diverter panels 93 in countercurrentrelation to the flow of ozonated air, it will once again be picked up bythe flow of air thereby creating a vortex action with the water incontinuous suspension in the airstream. When the scrubbing chamber hasabsorbed the maximum capacity of water into the air, any excess waterwill escape from the chamber, advance along the panel 90 and willcollect in the trough 92 for recirculation. The exhaust airstreamcontinues to travel upwardly through the diffuse plate 95 causingfurther mixing of the exhaust air, ozone gas and water. The exhaust airthen travels upwardly and along the deflector panel 99 which creates avortex action and forces the exhaust airstream through a deflectorpassage 88 and into the secondary plenum area 101. The exhaust air isthen drawn through the mesh filters 103 and 107 for further removal ofmoisture from the exhaust airstream. The exhaust airstream exits thefilters 103 and 107 and enters the rear tertiary plenum area 111 wherethe exhaust stream is drawn through at least one row of the filters 113to remove particles and finally through the side exhaust area 77.Preferably, housing 73 include at least two rows of high efficiencyglass fiber filters for removal of submicron particles. Preferably thefilters are rated at 90% to 95% efficiency for one micron-sizedparticles. Higher or lower efficiency filters can be utilized asrequired for individual applications. If desired, charcoal filters canbe substituted or added to the tertiary plenum area 111 so as to controlodor. Removal access panels P₁ and P₂ are provided on a front of thewall 78 in order to gain entry into the interior for maintenance orrepair and cleaning, if necessary, of the interior.

Another embodiment of the present invention is a dry scrubber whichincludes a housing 117 which is of generally rectangular configurationand elongated to traverse the substantial width of a cooking appliance.As shown in FIGS. 6 and 7, the exterior of the housing 117 includesopposite top and bottom walls 123, air inlet passage 121 and a rearvertical exit passage 125 extending between side walls 127. Insertedthrough the side walls 127 at the opening of the air inlet passage 121is a rigid stainless steel pipe 129 which extends the full width of thehousing 117 and protrudes through the walls 127. One end of the pipe 129is connected, as described earlier, to an ozone-producing apparatus,shown in FIG. 2. The rigid stainless pipe 129 is fitted with equallyspaced, round perforations 119 to provide even distribution of ozone gasinto the exhaust air along the full length of the air inlet passage 121.

The air inlet passage 121, as seen in FIGS. 6 and 7, is formed betweenspaced parallel upper and lower panel sections 116 and 118,respectively. Housing 117 contains a forward plenum area 120 including adiffuse plate 122, which is preferably a perforated metal platetraversing a portion of the front plenum area 120. A rear plenum area124 includes at least one, preferably two, rows of filters 126 and 128.The filters 126 and 128 traverse the width of the rear plenum area 124and are preferably high efficiency glass fiber filters rated at a 90% to95% efficiency for one micron-sized particles. Higher or lowerefficiency filters can be utilized and, if desired, charcoal filters maybe substituted for the filter 128 or added as an additional filter inthe rear plenum area 124.

In practice, when the exhaust fan is turned on, the exhaust airstream isdrawn in a horizontal direction through the inlet passage 121. Theexhaust air is intermixed with ozone gas from the pipe 129 and is drawnhorizontally through the diffuse plate 122 causing further intermixingof ozone gas with the exhaust airstream. The exhaust airstream passeshorizontally through the filters 126 and 128 for removal of submicronparticles, the exhaust air flowing through the exit passage 125.

In all applications, the ozone generation is continuous and is injectedcontinuously into the housing but the concentration of ozone will varyaccording to the mass flow rate of the exhaust airstream through theentrance passage. In general, each application utilizing water injectionmeans may also be used in a “dry” application. There are some instanceswhen it is impractical or inconvenient to use water injection as well asto provide for water and waste drainage. In these situations,utilization of ozone in combination with the exhaust airstream as wellas at least one baffle filter, allows for removal of contaminantsincluding odors while minimizing the amount of water that must beremoved from the housing.

It is therefore to be understood that while preferred and alternateembodiments of the present invention are set forth and described herein,various modifications and changes may be made without departing from thespirit and scope of the present invention as defined by the appendedclaims and reasonable equivalents thereof.

1. A ventilating system for extracting grease, odors and solid particlesfrom an exhaust airstream, said ventilating system comprising: a housingincluding an entrance passage and an exit duct; means for generatingozone; means for inducing the flow of said exhaust airstream throughsaid entrance passage; at least one filter member in said housing, saidfilter member having a pair of spaced filter supports and a bafflefilter therebetween, said filter member extending along a substantiallength of said housing; and means for injecting said ozone into saidexhaust airstream whereby to provide even distribution of said ozoneinto said exhaust airstream.
 2. A ventilating system according to claim1 wherein said ozone generating means of an oxygen generator includes acooling fan, adjustable flow gauges and electrical control panel.
 3. Aventilating system according to claim 1 wherein said ozone is injectedinto said housing from a location above said filter member.
 4. Aventilating system according to claim 1 wherein said injecting meansincludes a rigid stainless steel pipe with equally spaced perforations.5. A ventilating system according to claim 1 wherein said filter memberextends diagonally along a substantial length of said housing.
 6. Aventilating system according to claim 1 wherein said housing member isdefined by parallel sides, a lower entrance passage and an upper exhaustduct.
 7. A ventilating system according to claim 1 wherein said filtermember is placed directly in the flow of said exhaust airstream anddirectly below said exit duct.
 8. A ventilating system according toclaim 1 wherein said ozone generating means includes an electrode.
 9. Aventilating system for extracting grease, odors and contaminants from anexhaust airstream, said ventilating system comprising: a housing havinga lower entrance passage for said exhaust airstream, an upper exit duct,means for filtering said exhaust airstream; means for producing ozone;means for injecting said ozone into said housing whereby to provide evendistribution of said ozone gas into the exhaust airstream; and means forinducing the outward flow of said exhaust airstream through said upperexit duct.
 10. A ventilating system according to claim 9 wherein saidfilter means includes side support brackets and a filter memberextending diagonally along a substantial length of said housing.
 11. Aventilating system according to claim 9 wherein said injecting meansincludes a rigid stainless steel pipe with equally spaced perforations.12. A ventilating system according to claim 9 wherein said filter meansincludes at least one filter.
 13. A ventilating system according toclaim 9 wherein said housing includes means for discharging water intosaid housing.
 14. A ventilating system according to claim 13 whereinsaid discharge means includes a manifold extending along an upperportion of said housing and terminating in a recirculation pump.
 15. Aventilating system according to claim 14 wherein said housing includesmeans for intermixing said exhaust airstream, said ozone and said water.16. A ventilating system according to claim 15 wherein said intermixingmeans includes spaced diverter panels.
 17. A ventilating systemaccording to claim 13 wherein said housing includes means for collectingand recirculating excess water for reusage.
 18. A ventilating systemaccording to claim 9 wherein said housing includes a dry chamber definedby dry filter means for removing particulate matter.
 19. A ventilatingsystem according to claim 18 wherein said dry filter means includes atleast one glass fiber filter or charcoal filter.
 20. A ventilatingsystem for extracting grease, fumes and solid particles from an exhaustairstream created by a cooking appliance, said ventilating systemcomprising: a housing including an entrance and exit passage; means forinducing the flow of said exhaust airstream through said housing; meansfor producing ozone; means for injecting ozone into said housing wherebyto provide even distribution of ozone gas into the exhaust airstream;diffuse means for intermixing of said ozone with said exhaust airstream;filter means for removal of particulate matter from said housing; andsaid diffuse means and said filter means traversing the path of flow ofsaid exhaust airstream.
 21. A ventilating system according to claim 20wherein said housing member is defined by a parallel ceiling and floor,a side entrance passage and an opposite side exhaust duct.
 22. Aventilating system according to claim 20 wherein said diffuse meansincludes a perforated metal plate.
 23. A ventilating system according toclaim 22 wherein said diffuser means further includes spaced diverterpanels.
 24. A ventilating system according to claim 20 wherein saiddiffuse means is disposed in parallel relation to said filter means. 25.A ventilating system according to claim 20 wherein said filter meansincludes high efficiency glass fiber filters.
 26. A ventilating systemaccording to claim 20 wherein said filter means includes a charcoalfilter.
 27. A ventilating system according to claim 20 wherein saiddiffuse means and said filter means traverse a width of said housing.